Crimp fittings for metal-plastic pipes: design and connection rules

Maintaining comfort and reducing energy costs in your home requires reliable, efficient heating and insulation. Choosing the appropriate fittings is crucial when it comes to plumbing. We will examine the design of crimp fittings for metal-plastic pipes as well as the guidelines for correct connection in this article.

The longevity and performance of your plumbing system can be greatly impacted by selecting the appropriate fittings. In particular, metal-plastic pipes are becoming more and more well-liked because of their flexibility, durability, and ease of installation. For metal-plastic pipes in particular, crimp fittings are essential for leak-free connections and peak performance.

The first step to using crimp fittings effectively is to understand their design. Usually, there are two components to these fittings: the body and the ring. Typically composed of brass, the body features external barbs to provide a grip on the pipe. Before slipping the pipe into the fitting, the ring—which is frequently composed of copper, stainless steel, or other metals resistant to corrosion—is slipped over the pipe. These fittings provide a safe, airtight seal when correctly crimped.

The efficiency of crimp fittings depends on proper connecting. Using a pipe cutter, cut the pipe squarely and neatly as the first step. To guarantee a smooth connection, all burrs and jagged edges need to be eliminated. The fitting is put on after the pipe has been prepared and the crimp ring is placed over the pipe end. After that, the pipe is put into the fitting until it comes to a stop. In order to create a tight seal between the pipe and the fitting, the crimp ring is finally compressed using a crimping tool.

It’s imperative to adhere to the given guidelines when crimping in order to guarantee a dependable connection. Under-crimping could result in leaks, while over-crimping could harm the fitting. When it comes to the size and kind of crimp ring required for a given pipe and fitting, it’s critical to use the proper crimping tool and adhere to the manufacturer’s instructions.

You can guarantee a strong and leak-free plumbing system for your house by comprehending the design and adhering to the proper connection guidelines for crimp fittings. With crimp fittings installed correctly, you can rest easy knowing that your plumbing system is dependable, effective, and long-lasting.

Aspect Description
Design Crimp fittings are designed to connect metal-plastic pipes securely.
Material They are typically made of brass or other durable materials.
Connection The connection involves sliding a crimp ring over the pipe, inserting the fitting, and then compressing the ring with a crimping tool.
Seal Creates a watertight seal ensuring no leaks.
Application Commonly used in plumbing systems for hot and cold water.

What is a crimp fitting

Pipelines made of metal and plastic cannot be installed by welding or glueing; instead, mechanical crimping is utilized. Joints come in two varieties: fixed and detachable.

For the first kind, press fittings are utilized. Split joints are primarily utilized in wall-mounted or subterranean closed utility networks. There is no need for regular maintenance on them. A press jaw is a specialized tool used in their creation.

Split connections, which are currently the most popular, are made with crimp, or compression, fittings. They only need a few wrenches; expensive tools are not needed.

Design features

Split connections are typically used for connecting any operational devices as well as for installing open pipelines.

The components of compression fittings are as follows:

  1. coupling nut.
  2. Crimping ring (dryer, collet).
  3. O-rings made of E.P.D.M. (ethylene propylene diene rubber).
  4. Teflon dielectric gasket.
  5. Fitting body.
  6. Limiting shoulder.
  7. Stem.

On the product’s stem is a metal plastic pipe that has been properly prepared. In order to limit stray currents, this is done until it stops in the dielectric gasket.

Under the influence of internal pressure, the sealing rings help to reinforce the system’s tightness. With the aid of a collar, the union nut crimps the metal-plastic pipe on the stem.

The only tools needed for installing crimp connectors are scissors, a calibrator, a chamfer, and a set of wrenches. Fittings can always be taken apart and the pipes reconnected with them if needed. Compression connectors have a long lifespan if properly installed and used.

One drawback of these parts is that you have to regularly tighten them and keep an eye on their condition.

Costs related to crimp fittings

crimp fitting

It is important to understand crimp fittings for metal-plastic pipes if you want to heat and insulate your home. The foundation of your plumbing system, these fittings guarantee a safe and leak-free pipe connection. Crimp fittings, which are made to be dependable and long-lasting, are essential to preserving the integrity of your plumbing system. In order to maintain the longevity and efficiency of your insulation and heating system, you must be aware of the proper connection guidelines. Understanding these guidelines ensures that the insulation and heating systems in your house operate at their best and provide a hassle-free experience.

Types of fittings

Pipeline systems undergo direction changes, branching, plugging, connecting some devices, and diameter changes during operation. Assembly elements are used to solve all of these tasks. Each of these components has a unique shape based on what it is used for.

  1. Bends. Change the direction of flow by 45, 90 or 120 degrees.
  2. Couplings. Connect two pipes of the same diameter.
  3. Plugs. Closes the dead end.
  4. Tees, Crosses. They are used to create branches.
  5. Connectors. They are used to connect a flexible hose.

Pipelines with varying diameters are installed using transition couplings. Straight pipes are components that join pipe sections with the same number of holes.

What materials are made of

The following materials are used in the manufacturing of assembly elements: plastic, steel, copper, bronze, and cast iron. It is believed that matching pipe and connecting element materials are essential for the installation of engineering networks.

Cast iron, steel assemblies, copper (bronze and brass), and polyethylene (plastic) pipes are used to join carbon steel pipes. Because the metal-plastic piping is mechanically crimped together, the components’ materials need to be robust and ductile.

Compression fittings for metal or plastic pipe products consist of:

  • brass (an alloy of copper and zinc) plated with nickel or tin;
  • stainless steel.

Although brass products are more resistant to corrosion than assemblies made of stainless steel, their cost is also higher. These components go into making the assembly device’s body and coupling nut. The material used to make O-rings is synthetic rubber (EPDM). Teflon or stainless steel are used to make the crimp ring.

The pipeline jacket’s outer layer shouldn’t be harmed during the collet installation.

Criteria for selecting crimp fittings

Visit a specialized store to purchase crimp fittings for metal-plastic pipes. It is important to consider whether a quality certificate is present before buying such parts.

This document should take the following criteria into consideration:

  1. Manufacturer"s warranty.
  2. The maximum pressure and temperature that the connectors are designed to withstand.
  3. Material and weight of the product.

The device’s marking needs to be easily distinguished. The product’s weight needs to be verified. If the part is excessively light, it indicates that an aluminum-based alloy was used in place of brass or steel.

Make sure to read online product reviews. Manufacturers frequently employ less expensive raw materials to cut costs, but this often results in a decline in product quality. You don’t have to aim for huge savings in order to obtain a dependable pipeline, and you should always keep in mind that high-quality goods cannot be inexpensive.

It has long been established in practice that assembly components and metal plastic pipe products ought to come from the same manufacturer. This is due to several valid reasons. There can be a literal one millimeter difference in size between pipes and fittings made by different manufacturers. This is sufficient to lower the connection’s dependability.

The dimensions and shape of assembly elements are not standardized for all manufacturers. Every business sets its own standards for assembly tools and pipe products.

See the video for guidance on selecting a fitting.

Step-by-step instructions for connecting a pipe to a fitting

Any inexperienced person can install compression assembly elements as long as they carefully follow the technology. Three tools are needed for the task: two wrenches, a calibrator, and a pipe cutter. The metal plastic pipe needs to be straightened before the installation can begin.

The primary phases of the work:

  1. Measure the pipe section of the required size and cut it with a pipe cutter or a hacksaw with fine teeth.
  2. Deburr the place of cut with a chamfer or file.
  3. Use the calibrator to restore the ovality of the hole.
  4. Put the coupling nut on the pipe first and then the crimp ring.
  5. Lubricate the stem of the fitting with silicone.
  6. Put the end of the pipe tightly, up to the stop in the dielectric ring, on the stem of the connecting element.
  7. Screw the coupling nut on first by hand and then fasten it by crimping with two wrenches.

To prevent deforming the threads or crushing the sealing rings, do not use excessive force when tightening the nut. It is essential to make sure the system is tested by adding working fluid to it once it has been assembled. Should there be any leaks, re-crimp the fittings.

See how to install collet fittings in a pipeline.

Cost of crimp fittings of different manufacturers

Compression fitting connector costs are determined by the manufacturing company, technical conditions, material and weight types, and other factors. There are products from both domestic and foreign manufacturers available on the market today, and their prices vary. Additionally, the price may change based on the seller and the area.

You must carefully consider the parameters of each product in order to select high-quality items at reasonable prices. Look through the catalogs of sanitary product manufacturers and sellers to find details about connecting elements and their costs.

For comparison: features and costs of various manufacturers’ crimp fittings for metal-plastic pipes.

Manufacturing company Parameters
Material Diameter, mm Maximum pressure, bar Maximum temperature, °C Manufacturer"s warranty, years Price, rub.

The longevity and effectiveness of your insulation and heating system depend on the fittings you choose for your metal-plastic pipes. Because of their simplicity, effectiveness, and ease of installation, crimp fittings stand out as a dependable option. You can make sure that the system is effective and leak-free by having a thorough understanding of their design and the appropriate connection rules.

It is crucial to comprehend how crimp fittings are made. The body, the compression ring, and the nut are their three usual components. The pipe is inserted into the fitting’s body, which is compressed against the pipe by the compression ring. The fitting is then fastened in place with a nut. Crimp fittings are very dependable and efficient because of their straightforward design.

Your insulation and heating system’s performance depends on proper installation. It’s important to abide by connection rules. Make sure the pipe is first cut squarely and neatly. Next, push the pipe as far as it will fit into the fitting. Next, compress the crimp ring over the pipe and fitting using a crimping tool. This produces an impenetrable seal that guards against leaks and guarantees your system’s effectiveness.

The simplicity of installation of crimp fittings is one of their main benefits. Crimp fittings install more quickly and safely because they don’t require heat, unlike soldering or other connection techniques. Furthermore, crimp fittings are adaptable and extensively applicable since they can be utilized in a variety of applications, such as potable water systems, heating and insulation systems, and more.

To sum up, crimp fittings are a great option for joining plastic and metal pipes in your insulation and heating system. They are a well-liked option for both professionals and homeowners due to their straightforward design, simplicity of installation, and dependability. You can guarantee a leak-free and effective system that will keep your house warm and well-insulated for many years to come by being aware of their design and adhering to the proper connection guidelines.

Video on the topic

How to install an HDPE fitting on a pipe

Crimp fittings. Installation rules

How to crimp a metal-plastic pipe fitting. Practice and tips in the work

metal-plastic pipes – secret connection

Metal-plastic pipes.VALTEC press system overview.

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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